code: def test_tcdrain(self):
      termios.tcdrain(self.fd)
      termios.tcdrain(self.stream)
  
imports: import errno
  import os
  import sys
  import tempfile
  import unittest
  from test.support.import_helper import import_module
label_desc: Use image node_id 9 for calling the TestFunctions obj's underlying member method code with example usage: obj.test_tcdrain() without return types